Restricted Cast, who would you pick?

PowerPandaI'

So, I think I'd actually give the 4th character slot to Cyan. I think it works best with the story, and gives the characters a reason to be involved in portions of the plot that they otherwise wouldn't. Gameplay-wise, he also balances out the party by giving a heavy armor/high damage character.

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Been playin yer the Final cut of Divergent Paths and this makes excellent sense. Even with Divergent Paths I could see Divergent Paths being a special event story.

The Brothers story would be this huge special event that leads to your 4th permanent party member. Maybe those three scenarios would even be part of certain final battles where you call on your allies.